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/*
Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
if(!dojo._hasResource["dojo.Stateful"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo.Stateful"] = true;
dojo.provide("dojo.Stateful");
dojo.declare("dojo.Stateful", null, {
// summary:
// Base class for objects that provide named properties with optional getter/setter
// control and the ability to watch for property changes
// example:
// | var obj = new dojo.Stateful();
// | obj.watch("foo", function(){
// | console.log("foo changed to " + this.get("foo"));
// | });
// | obj.set("foo","bar");
postscript: function(mixin){
if(mixin){
dojo.mixin(this, mixin);
}
},
get: function(/*String*/name){
// summary:
// Get a property on a Stateful instance.
// name:
// The property to get.
// description:
// Get a named property on a Stateful object. The property may
// potentially be retrieved via a getter method in subclasses. In the base class
// this just retrieves the object's property.
// For example:
// | stateful = new dojo.Stateful({foo: 3});
// | stateful.get("foo") // returns 3
// | stateful.foo // returns 3
return this[name];
},
set: function(/*String*/name, /*Object*/value){
// summary:
// Set a property on a Stateful instance
// name:
// The property to set.
// value:
// The value to set in the property.
// description:
// Sets named properties on a stateful object and notifies any watchers of
// the property. A programmatic setter may be defined in subclasses.
// For example:
// | stateful = new dojo.Stateful();
// | stateful.watch(function(name, oldValue, value){
// | // this will be called on the set below
// | }
// | stateful.set(foo, 5);
//
// set() may also be called with a hash of name/value pairs, ex:
// | myObj.set({
// | foo: "Howdy",
// | bar: 3
// | })
// This is equivalent to calling set(foo, "Howdy") and set(bar, 3)
if(typeof name === "object"){
for(var x in name){
this.set(x, name[x]);
}
return this;
}
var oldValue = this[name];
this[name] = value;
if(this._watchCallbacks){
this._watchCallbacks(name, oldValue, value);
}
return this;
},
watch: function(/*String?*/name, /*Function*/callback){
// summary:
// Watches a property for changes
// name:
// Indicates the property to watch. This is optional (the callback may be the
// only parameter), and if omitted, all the properties will be watched
// returns:
// An object handle for the watch. The unwatch method of this object
// can be used to discontinue watching this property:
// | var watchHandle = obj.watch("foo", callback);
// | watchHandle.unwatch(); // callback won't be called now
// callback:
// The function to execute when the property changes. This will be called after
// the property has been changed. The callback will be called with the |this|
// set to the instance, the first argument as the name of the property, the
// second argument as the old value and the third argument as the new value.
var callbacks = this._watchCallbacks;
if(!callbacks){
var self = this;
callbacks = this._watchCallbacks = function(name, oldValue, value, ignoreCatchall){
var notify = function(propertyCallbacks){
if(propertyCallbacks){
propertyCallbacks = propertyCallbacks.slice();
for(var i = 0, l = propertyCallbacks.length; i < l; i++){
try{
propertyCallbacks[i].call(self, name, oldValue, value);
}catch(e){
console.error(e);
}
}
}
};
notify(callbacks['_' + name]);
if(!ignoreCatchall){
notify(callbacks["*"]); // the catch-all
}
}; // we use a function instead of an object so it will be ignored by JSON conversion
}
if(!callback && typeof name === "function"){
callback = name;
name = "*";
}else{
// prepend with dash to prevent name conflicts with function (like "name" property)
name = '_' + name;
}
var propertyCallbacks = callbacks[name];
if(typeof propertyCallbacks !== "object"){
propertyCallbacks = callbacks[name] = [];
}
propertyCallbacks.push(callback);
return {
unwatch: function(){
propertyCallbacks.splice(dojo.indexOf(propertyCallbacks, callback), 1);
}
};
}
});
}
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